SMITHSONIAN INSTITUTION. 
UNITED STATES (NATIONAL MUSEUM. 
de tek iad ; 
AUG 20 1890 
NOTES ON NORTH AMERICAN CRAYFISHES, 
FAMILY ASTACID-. 
BY 
WALTER FAXON. 
es 
From the Proceedings of the United States National Museum, Vol. XII, pages 619-634. 
[No. 785.] 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
1890. 
